Grand Canyon If Grand Canyon consists of layers of millions of years of sedimentary rock, how did it form? When did the layers form? When did the weathering and erosion take place? Were the rocks or the canyon, original rocks on Earth? Why or why not?
Sedimentary rock Sandstone; made from particles of other rock, finely weathered and compacted; Glued with calcite mineral On sea floor Seas contain abundance of calcite Shelled organisms are made of calcite
Beautiful sandstone landscapes Iron oxidized is iron oxide Fe 2 O 3 (rust) Hence the coloring
The Palisades in Northern New Jersey Overlooking the Hudson River Diabase; extrusive igneous (mafic) Similar to basalt This region was once overrun by volcanic fields Prior to the volcanic action, rock was subjected to tectonic, subduction forces What type of rock lies below the Palisades?
The Palisades in NJ overlooking the Hudson River
Desert Geysers in the black rock canyon of Nevada Note the colors of nature Orangy red due to oxidized iron Yellow- sulfur Green is mold/algae Water and Hydrogen sulfide and Carbon dioxide – gases released
Minerals from Earth interior may combine to form rock
Marble shows classic re-crystallization Distortion Hard, dense rock due to pressurization Used for government buildings, monuments,businesses, schools Flooring- lasts forever Pink, white, green- high polish possible Beautiful, functional-valued quarries